Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Project Engineer designs and deploys first-of-a-kind mining and refining technologies at our Moab site. In this role, you will work across Mariana's process development, software, plant engineering, project execution, and operations teams to plan, build, and deliver the cross-functional projects that move our plant forward. The work varies week to week, from scoping a project and sizing equipment to standing beside the mechanic and electrician during startup. You will own projects from idea to handover and build new skills along the way.
Responsibilities
Scope, design, and lead process improvement and capital projects from concept through commissioning
Develop process flow diagrams, P&IDs, mass and energy balances, and equipment specifications
Size and select pumps, tanks, piping, and other process equipment
Use plant data to find bottlenecks, improve recovery, and cut costs
Work with the project mechanic and project electrician on installs, checkout, and startup
Partner with controls and operations teams on control strategies and operating procedures
Lead hazard reviews and management of change, and keep projects compliant with site safety standards
Manage project scope, schedule, and budget, including vendor and contractor coordination
Qualifications & Experience
Bachelor's degree in Mechanical Engineering preferred or another related engineering degree
Process or mechanical engineering experience in mining, chemical, oil & gas, or other heavy industrial operations, 4+ years
Hands-on experience taking projects from design through commissioning and startup
Comfort reading and producing P&IDs, PFDs, and equipment datasheets
Strong data skills; experience with process data historians, Python, or similar tools is a plus
Experience with hydrometallurgy, leaching, solvent extraction, or electrowinning is a plus
Comfort working independently and a willingness to jump into unfamiliar problems
EIT or PE is a plus
Schedule
Monday-Friday Days
Occasional weekends based on project needs
Working Environment & Physical Requirements
Work in the processing plant in all weather conditions, including extreme temperatures, with exposure to fumes, dust, diesel, solvents, sulfuric acid, and other hazardous materials
Able to stand, climb, bend, and kneel for extended periods, including work at heights and in tight spaces
Adequate visual acuity, depth perception, and hearing (with correction or aids if needed) to work safely around operating equipment
Ability to lift a minimum of 50 pounds
Ability to wear required PPE at all times on site, including hard hat, safety glasses, steel-toe boots, hearing protection, and respiratory protection when needed
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!